title: Examination of categorical approach to symptom assessment: cross-validation of foulds' Delusions-Symptoms-States Inventory with Korean non-patient and patient groups.
abstract: BACKGROUND
  Foulds' Delusions-Symptoms-State Inventory (DSSI) has been purported to be a reliable, systematic categorical measure to assess the patients with schizophrenia according to the degree of illness. However, further cross-validations using other clinical measures and diverse samples from other cultures have not been advanced recently. We aimed to examine the validity of the DSSI hierarchical class model using both Korean non-patient and patient (schizophrenia and depression) groups.
  
  
  METHODS
  The hypothesis of inclusive, non-reflexive relationships among the DSSI classes was tested. The power of DSSI to detect presence of symptoms was assessed via cross-validation with other clinical measures, and the differences between the clinical features among the DSSI classes were examined using the Minnesota Multiphasic Personality Inventory (MMPI).
  
  
  RESULTS
  The high rate of model conformity (91.1%) across the samples and cross-validation with other criterion measures provided further support for the validity of DSSI.
  
  
  CONCLUSIONS
  DSSI is a reliable self-report measure that can be applied to both patient and non-patients to assess the presence and severity of psychiatric illness. Future studies that include more diverse clinical groups are necessary to lend further support for its utility in clinical practice.
authors.affiliation: Institute of Human Behavioral Medicine, Seoul National University College of Medicine, Seoul 110-744, Republic of Korea. kys@snu.ac.kr.
authors.forename: Samuel Suk-Hyun
authors.initials: SS
authors.lastname: Hwang
authors.forename: Yeni
authors.initials: Y
authors.lastname: Kim
authors.forename: Jae Seung
authors.initials: JS
authors.lastname: Chang
authors.forename: Da Young
authors.initials: DY
authors.lastname: Yun
authors.forename: Yong Sik
authors.initials: YS
authors.lastname: Kim
authors.forename: Hee Yeon
authors.initials: HY
authors.lastname: Jung
mesh_terms: D000293:Adolescent; D000328:Adult; D044466:Asian People; D003702:Delusions / Q000175:diagnosis*; D003866:Depressive Disorder / Q000175:diagnosis; D059026:Diagnostic Self Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008960:Models, Psychological; D056910:Republic of Korea; D012559:Schizophrenia / Q000175:diagnosis*; D063189:Symptom Assessment